Pierceable closure for medicine bottles

ABSTRACT

A medicine bottle closure that can be stuck through, with a flanged cap and with a sealing disc, which is made of at least two different materials and which is anchored on the front face of the bottle mouth, characterized in that a sealing disc 3 which seals the flat front face 5 of the bottle mouth 1a, which is made with a bevel-off 6 of its outer rim, consists of a layer, preferably of a Teflon disc 8 or of a similar foil, which covers the bottle opening and approximately half the bottleneck frontface 5 annular area delimited by its outer and inner diameters, and consists of an elastomeric gastight covering 7 which covers the bottle opening and the entire front face, upon the middle zone of which disc is applied the Teflon disc 8, and characterized in that this covering disc 7 carries at its outer rim, as an anchorage, a ridge 7b that fits the bevel 6 at the outer rim of the bottle mouth.

United States Patent [72] Inventor Hans Wimmer Vicht, Germany [21} Appl.No. 880,483 (22] Filed Dec. 10, 1969 Continuation of Ser. No. 779,544,Nov. 27, 1968, now abandoned [45] Patented Jan. 5, 1971 [73] AssigneeThe West Company Phoenixville, Pa. a corporation of Pennsylvania [32]Priority Nov. 29, 1967 [33] Germany [31 No. P1,566,542

[54] PIERCEABLE CLOSURE FOR MEDICINE BOTTLES 9 Claims, 5 Drawing Figs.

[52] 11.8. C1 215/37, 215/40 [51] Int. Cl. B65d 41120, B65d 41/50, 865d41/22 [50] Field ofSearch 2l5/37,40

[56] References Cited UNITED STATES PATENTS 3,198,368 8/1965 Kirkland eta1. 215/37 3,424,329 1/1969 Hershberg et a1 215/37 PrimaryExaminer-George T. Hall Attorney-Howson and Howson ABSTRACT: A medicinebottle closure that can be stuck through, with a flanged cap and with asealing disc, which is made of at least two different materials andwhich is anchored on the front face of the bottle mouth, characterizedin that a sealing disc 3 which seals the flat front face 5 of the'bottle mouth la, which is made with a bevel-off 6 of its outer rim,consists of a layer, preferably of a Teflon disc 8 or of a similar foil,which covers the bottle opening and approximately half the bottleneckfront-face 5 annular area delimited by its outer and inner diameters,and consists of an elastomeric gastight covering disc 7 which covers thebottle opening and the entire front face, upon the middle zone of whichdisc is applied the Teflon disc 8, and characterized in that thiscovering disc 7 carries at its outer rim, as an anchorage, a ridge 712that fits the bevel 6 at the outer rim of the bottle mouth.

PATENTEDJAN 5m: 3552.591

' sum 1 or 2 FIGB.

mvsu'roa HANS WIMMER ATT vs.

Pmamwm swan A 35521591 sum 2 BF 2 FIG-4.

INVEN RI HANS WIM R BY W ATTVS.

I through.

There is already known a closure, for medicine bottles, which can bestuck through and which has a sealing disc anchored relatively to thebottle mouth. In this case the anchoring is formed of an annularprotruding head of the bottle mouth which cooperates with acorresponding annular groove provided in the sealing disc.

This form of construction has a number of drawbacks. In

the first place, providingthe bottle mouth with such an annular bead isexpensive and also requires not inconsiderable manufacturing tolerances,because glass bottles can not be produced with great accuracy. Moreoverwith this type of anchorage for the sealing disc on the bottle mouth itis not easily possible to house a second cosealing part of the sealingdisc. In the case of medicine bottles it is however, often desired thatthe sealing disc shall have a number of materials, of which the materialof the side turned toward the inside of the bottle should in particularbe chemically inert, while the outer part of the sealing disc shouldeliminate certain disadvantages of the first-named part and/or should beless expensive material, for forming the cheaper part of the sealingdisc. in addition, in the case of closures, for medicine bottles, thatcan be stuck through, a radially acting anchorage of the sealing disc isalso needed, because the flanged cap often does not hold the sealingdisc sufficiently immovable in the said direction. For certainmedicaments there has proved to be particularly suitable for the innerpart of the sealing disc, which is turned toward the medicament, asynthetic substance having the trademark Teflon," which is chemicallyinert with respect to many substances and is obtainable commercially. Onthe other hand, however, perfect sealing between a Teflon disc and thefront face of a bottle mouth is practically impossible, becauserelatively hard synthetic substances such as Teflon are unable to adaptthemselves properly to unevennesses of the front face of glass bottles,so that the content of the bottle creeps between the Teflon disc and thefront face of the bottle and emerges out of the bottle, and/or unsterileair can get from the outside into the inside.

in accordance with an already known process for producing a sealing discmade of two different materials, as a closure that can be stuck throughfor medicine bottles, and in particular a process for the application ofa Teflon disc on a rubber sheet, it is known how to stick these to oneanother, and to use hereby for this sticking together an adhesive suchas is ordinarily used for sticking rubber to metals.

Such a process has the drawback that the adhesive, under the relativelyhigh temperature of the following vulcanization operation, readilybecomes resinified or hardened, through which it is no'longer possibleto use a bottle closure consisting of such sealing discs to meet thepurpose of the invention, as a closure, for medicine bottles, that canbe stuck through to remove the content of the bottle by means of acannula, because for the removal of the medicament the rubber disctogether with the Teflon disc have to be stuck through, and

during this sticking through, from the zone between the Teflon disc andthe rubber disc residues or portions of the adhesive used to stick thediscs together may get into the interior of the cannula, through whichunforeseeable injury may be done to patients.

The fundamental problem of the invention is to create for medicinebottles a closure that can be stuck through, consisting of a sealingdisc that has a material that is chemically inert whereby there isobtained above all a reliable sealing and also sufficient anchorage ofthe sealing disc, and furthermore the cost of making such a medicinebottle and its closure comes out as cheap as possible, and the problemincludes creating a process for the production of a sealing discconsisting ofat least two different materials, by which process,preferably,- a

Teflon disc, is vulcanized on a rubber disc without it being necessaryto use an adhesive as a bonding means. I

For solving this problem the invention proposes that, in the case of amedicine bottle closure that can be stuck through,

this closure be made in such a way that a sealing disc which rim, asananchorage, a ridge that fits the bevel at the outer rim of the bottlemouth.

Through this it is obtained that the bottle contents can be sealed,essentially by means of a chemically neutral material,

namely a synthetic substance of the Teflon type, and this relativelyexpensive Teflon disc can be thin, and at the outer zone of the bottlefront face there is a covering disc that is gastight and sufficientlyelastic to complete the seal, and it can also,,in association with theridge at its outer rim and the flanged cap form an anchorage.

A particularly favorable and reliable anchorage is obtaine when theridge of the covering disc is made substantially wedge-shaped is sodimensioned that it becomes clamped tightly after the flanging-in of thecap.

In an advantageous way the middle zone of the covering disc, whichcarries the Teflon disc or the like, can be sur-. rounded by an annulargroove. This is not only of advantage during the production in that itis possible to center the Teflon disc, which is to be bonded to thecovering disc, properly in a specified position, but the Teflon disc,during its vulcanization on the covering disc, can contract slightlyinward, through which a better hold in the radial direction is obtained.

The angle of bevel of the ridge of the covering disc can be flatter thanthe bevel on the bottle mouth, so that the apex of the ridge, in itsunformed state, projects somewhat over the rest of the diameter of thecovering disc.

The Teflon disc can be bent a little inwardly into the annular groove.

The problem of finding a process for the vulcanization of a Teflon discon a rubber plate, without having to resort to the aid of an adhesive,was solved in that an elastic raw-rubber plate, consisting of a rubbermixture having in its freshly prepared state an adhesive effect, iscovered with a disc of Teflon or the like kind of foil having aroughened surface, and while still in a fresh stateit is pressed upon orapplied upon this foil, and in that in a second operation the side ofthe rawrubber plate to which the Teflon foil is applied is laid in apress upon an annular cutting tool having a diameter greater than theinner diameter of an annular groove of the covering disc in its finishedstate, and is pressed under relatively high pressure until the elasticraw-rubber plate is compressed to such an extent that thecounterpressure becomes so great that the cutting tool cuts through theTeflon foil and the rubber plate under pressure, after which, afterrelief of the pressure, the reascending diameter-decreasing coveringdisc blank, with its applied disc of Teflon or the like projecting overthe inner diameter of the subsequent groove, is in a third operationbrought to the final peripheral form of the sealing disc and issubjected to a vulcanization operation, whereby the projecting edges ofthe applied Teflon disc become included in the inner zone delimited byan annular former part forming the groove of the sealing disc.

in the case of the rubber mixture, the expression fresh state existingafter-its production-means that statein which this rubber mixture is asa rule still warm, and is in any event still unpowdered and for thatreason displays a sticky effect. With certain materials the adhesiveeffect, among other things, can be retained for a short time in the coldstate while 'the just produced rubber mixture is still unpowdered. Inall cases the important thing is that the rubber mixture, when after itsproduction it is still unpowdered, has its adhesive effect utilized.

The process of the invention affords the advantage that the applicationof a roughened covering disc or foil, preferably made of Teflon, enablesthis foil to stick tightly when it is applied directly after theproduction of the raw-rubber plate, made from a rubber mixture, while itis in a fresh state before being powdered, through which it isunnecessary to use a sticky medium as an adhesive, with all theaforesaid drawbacks. This application process is made possible in thatthe rubber mixture, made in the usual way in accordance with thespecifications prescribed for covering discs for sealing the medicamentsconcerned, while it is still in a hot state and is unpowdered, has verygreat surface adhesiveness, which vanishes after the vulcanizationoperation, but persists however at that place covered by the applicationof the roughened Teflon disc, because the presence of atmospheric oxygenis necessary for eliminating the surface adhesiveness.

A further advantage of the process of the invention is that it becomespossible for the foil to project somewhat over the stamped-out roundparts, so that these projecting edges can be bent over, for betteranchorage in the rubber part, by the pressure from the press.

Further details of the invention are explained in more detail by the aidof the drawings, where, in different scales:

FIG. 1 shows a vertical lengthwise section through the upper part of amedicine bottle having a closure that can be stuck through;

FIG. 2 shows to an enlarged scale a partial section through the sealing;

FIG. 3 shows a cross section through the cutting tool in which issituated the Teflon foil and the preshaped hardened raw-rubber plate,with the Teflon disc applied to it, and this namely directly prior tothe cutting operation;

FIG. 4 shows the cutout disc blank, provided with the Teflon foil, whileit is being brought into the vulcanization mold, shown in section; and

FIG. 5 shows in section the finished sealing disc, in the closedvulcanization mold shown in section.

A medicine bottle 1 has a closure designated as a whole by 2. Thisclosure has a two-part sealing disc 3, which is fastened by means of aflanged cap 4 to the bottle mouth designated as a whole by la. Theflanged cap 4 hereby is in known wise set in the middle zone of aso-called tear-off tab 4a, and through tearing upward this tab themiddle region of the sealing disc 3 is exposed, so that it is possibleto stick through it, for example a hollow needle, a cannula or the like,and then to draw off part or all of the bottles contents.

Medicine bottles 1 having such closures 2 are often used as infusionflasks, whereby a hollow needle of fairly large diameter is frequentlystuck through the sealing disc 3.

The front face 5 of the bottle mount 1a is in known wise made flat, andit is part of the invention that it has at its outer rim'an annularbevel 6. The sealing disc 3 consists of two parts: namely a coveringdisc 7 and a thin Teflon disc 8. The covering disc 7 is made of anelastomeric gastight material, of butyl rubber for example. The middlezone of the covering disc, surrounded by an annular groove 9, is coveredby a Teflon disc 8, which is fastened on by the process of theinvention. Here the diameter of the Teflon disc 8 and the inner diameterof the annular groove 9 are respectively so that about half thebottleneck front-face annular area 5 delimited by its outer and innerdiameters is covered by the Teflon disc 8.

As a material for the elastomeric gastight covering disc 7 butyl rubbercan be of good use. The Teflon disc 3 is near the annular groove 9 inthe covering disc 7 bent upward at its rim,

as can be clearly seen from FIG. 2. Through this the Teflon disc 8 has abetter hold in the radial direction also.

The aforesaid annular groove 9, whose shape is. ad vantageous forcentering the raw-rubber plate 7a inv the vulcanizing mold (FIGS. 41 and5), has advantages evenafter the bottle is closed: it then acts so tosay asalabyrinth lf a perfect seal is practically never obtained betweenthe Teflon disc 8 and the front face 5 of the bottle mouthbecauseTeflQnor a similarly hard material is unable to adapt, itselfsufficiently to unevennesses of the glass, there still remains alabyrinthlike annular space between the Teflon disc and the zone-.thecovering disc 7 bears against. This groove exerts a barrier effectparticularly when there prevails in it a pressure greater than prevailsin the interior of the bottle, for example in the case of evacuatedbottles. With medicine bottles 1- that have tobe sterilized again afterbeingjtilled, an above-normal pressure may be produced in theannularigroove 9 and be maintained there, for a certain time at'least.This pressure difference then prevents any slowly emerging contents ofthe bottle from creeping between the bottle front face 5 and the Teflondisc 8, so as to then react chemically withthe-covering disc 7 and exerta marked reaction on the contents of the bottle. Slight quantities ofthe contents of the bottle that go radially outside the Teflon disc 8 toenter into reaction with the covering disc 7 would for the greater partremain in theannular groove 9.

By means of the invention there is obtained a medicine bottle having aclosure 2 with which chemically neutral and on I occasion very hardsynthetic substances, such as Teflon,

which have unfavorable characteristics as respects sealing inassociation with glass, but which on the other hand have very desirablecharacteristics, can be used for the sealing disc 3. Both themanufacture of the medicine bottle-1 and also the manufacture of thesealing disc and the flanging over hereby remain very simple.

A substantial part of the invention is represented by the bevel 6 of thebottle mouth in cooperation with the ridge 7b at the outer rim of thecovering disc 7. The dimensions of the ridge are adapted to the bevel 6at the outer rim of the bottle mouth, and it is made somewhatwedge-shaped with its apex turned downward, and it is preferablydimensioned so that during the flanging-in of the flanged cap 4 itbecomes clamped tightly on the bottle mouth. Through this there isobtained both a good supplementary sealing with the covering disc 7, andalso an anchoring of this covering disc 7 and thus of the entire sealingdisc 3. The aforesaid clamping attachment of the sealing disc 7 isneeded in particular for processing the medicine bottles in completelyautomatic flanging machines, because these flanging machineson accountof the tolerances of the glass medicine bottle l"--do not always operatewith the same flanging pressure, so that the flanged cap 4 does notalways receive the same flanging pressure, and thus the pressure on theglass rim, over which the flanging takes place, is not always uniform.It is true that the flanging pressure can be adjusted so that asufficientsealing of liquids is obtained; however a sufficient sealingagainst gases can not be obtained. In accordance with a furtherdevelopment of the invention, where the bevel angle a (FIG. 2) of theridge 7b is flatter or is much flatter than the angle of the bevel 6 atthe bottle mouth, the result is that there is also good sealing betweenthe outer rim 6 of the bottle and the ridge 7b even when the coveringdisc 7 is no longer clamped very tightly against the front face 5 of thebottle mouth 1a by the flanged cap 4. This reliable sealing in theregion of the ridge 7b is to a great extent independent of theproduction tolerances. A good carrying along of the ridge 7b by thestill open flanged cap 4 while it is being put on is obtained when theapex 7c of the ridge 7b, in its undeformed state, projects somewhatbeyond the remaining diameter of the coveringdisc The sealing discconsisting of a Teflon foil fastened on a rubber disc can be produced,without using any adhesive for sticking them together, as follows: I

A covering disc 7 is made from a specially composed rubber mixture,which meets most of the requirement relatively to the contents to besealed in the bottle, and which has raw-rubber surface adhesiveness,which vanishes after vulcanization at the places exposed to the air andgenerally powdered, and which has the property of adhering to aroughened Teflon foil. For this purpose there is applied on such araw-rubber plate 7a while it is still hot, directly after it has beenproduced, a Teflon foil 8, with its roughened surface pressed againstthe plate 7a.

In order to ensure that the Teflon disc is somewhat greater than theinner diameter of the annular groove 9, disposed in the covering discwhen it is in its finished state, and in order later on to be able tobend these projecting edges of the Teflon disc 8 in the direction of theannular groove 9, to make it possible to obtain a better holding oftheTeflon disc 8, the side of the raw-rubber plate 7a upon which theTeflon foil 8a is applied is laid on a not too sharp cutting tool (FIG.3), upon which tool the round shape is stamped out under high pressure.The Teflon foil 8a'in the first instant takes the pressure without thecutting tool cutting'into it. By means of the pressure on the raw-rubberplate the rubber plate becomes compressed until the pressure has becomeso great that the not too sharp circular knife 20 cuts into the Teflonfoil 8a (FIG. 3). The circular knife 29 has at this same instant thecounteraction of a pressed flat and somewhat radially expandedraw-rubber plate, which after the pressure is relieved ascends again andbecomes smaller in diameter, while the stamped-out Teflon disc 8projects somewhat over the inner diameter of the annular groove 9. Afterthis, the covering disc 7, provided with the Teflon disc 8, is put intoa mold 21, 22, whereby the projecting edges of the Teflon disc 8 becomebent up by the forming part f that makes the annular groove H65. 4 and5).

After oxygen has reached the sides of the disc 7 not covered by theTeflon disc 8, the great surface adhesiveness of the former vanishes atthe places coming into contact with air, and they may if desired bepowdered in knownwise.

The anchorage of the covering disc and on occasion an improvement of itssealing action, is obtained by the ridge 7b of the invention, whichduring the flanging-in becomes clamped laterally against the bottlemouth. This squeezing-in of the pointed runout of the ridge 7b ispromoted in that the diameter of the medicine bottle, like all glassobjects, has relatively large manufacturing tolerances, so that theflanged cap 4 leaves a certain clearance between it and the outercontour of the bottle mouth 1a, into which clearance parts of the ridge7b become drawn during the flanging operation, and at the end of theflanging operation they are clamped there with a sealing effect. Theclamping attachment is important particularly when a hollow needle isstuck with great force through the sealing disc 3, or when such anoperation is done repeatedly by a cannula. It is advantageous in thelatter case that'the covering disc 7 consists of an elastomeric materialthat closes up again after the cannula is removed from the stuck throughhole.

lo a way that is of itself known the covering disc 3 can have a thinning12 of its wall, to facilitate the sticking-in.

It should also be mentioned that the sealing disc blank 7, 8 put intothe open mold 21, 22 is dimensioned as respects its part 7, which is forexample made of butyl rubber, in such a way that this material, when themold parts 21, 22 are closed, fills the remaining hollow space, as isshown by a comparison ofFlGS.4and 5.

lclaim:

l. A medicine bottle closure that can be stuck through, with a flangedcap and with a sealing disc which is made of at least two differentmaterials and which is anchored on the front face of the bottle mouth,characterized in that a sealing disc 3 which seals the flat front face 5of the bottle mouth la, which is made with a bevel-off 6 of its outerrim, consists of a layer, preferably of a Teflon disc 8 or of a similarfoil, which covers the bottle opening and approximately half thebottleneck front-face 5 annular area delimited by its outer and innerdiameters, and consists of an elastomeric gastight covering disc 7 whichcovers the bottle opening and the entire front face, upon the middlezone of which disc is applied the Teflon disc 8, and characterized inthat this covering disc 7 carries at its outer rim, as an anchorage, aridge 7b that fits the bevel 6 at the outer rim of the bottle mouth.

2. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 1, characterized in that the ridge 7b of thecovering disc 7 is dimensioned, and preferably made somewhatwedge-shaped, so that after the flanging-in operation it is clampedtightly in position.

3. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 1, characterized in that the bevel angle of theridge 7b is flatter than the bevel 6 at the bottle mouth la, andpreferably the apex 7c of the ridge 7!; in its undistorted stateprojects somewhat over the remaining diameter of the covering disc 7.

4. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 1, characterized in that the middle zone of thecovering disc 7, which carries the Teflon disc 8 or the like, issurrounded by an annular groove 9.

5. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 4 characterized in that the Teflon disc 8 is drawnsomewhat into the interior of the annular groove 9.

6. A process for the production of a sealing disc which consists of atleast two different materials and is in accordance with one of theforegoing claims,'and which forms a sealing disc which can be stuckthrough, for the closure of medicine bottles, characterized in that anelastic raw-rubber plate 7a, consisting of a rubber mixture having inits freshly prepared state an adhesive effect, is covered with a disc 8of Teflon or similar foil having a roughened surface, and while still ina fresh state it pressed upon or applied upon it the said foil; andcharacterized in that in a second operation the side of the rawrubberplate to which the Teflon foil is applied is laid in a press upon acircular cutting tool 20 havinga greater diameter than the innerdiameter of an annular groove 9 in the covering disc in its finishedstate, and is pressed under relatively high pressure until the elasticraw-rubber plate 7a is compressed to such an extent that thecounterpressure becomes so great that the cutting tool cuts through theTeflon foil and the rawrubber plate, after which, after relief of thepressure, the reascending diameter-decreasing covering disc blank 70,with its applied disc8 of Teflon or the like, now projecting over theinner diameter of the subsequent groove 9, is in a third operationbrought to the final peripheral form (al, 22 22) of the sealing disc 3and is subjected to a vulcanization operation, whereby the projectingedges of the applied Teflon disc become bent into the inner zone Bdelimited by an annular mold part f which forms the groove 9 in thesealing disc 3.

7. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 2, characterized in that the middle zone of thecovering disc 7, which carries the Teflon disc 8 or the like, issurrounded by an annular groove 9.

8. A closure, which can be stuck through, for medicine bottles, inaccordance with claim 3, characterized in that the middle zone of thecovering disc 7, which carries the Teflon disc 8 or the like, issurrounded by an annular groove 9.

9. A closure adapted to be held in place over the opening in a containerby a flanged cap comprising an elastomeric gastight covering disc 7, alayer 8 of Teflon secured to the inner face of said covering disc 7confronting the container opening, said layer 8 being of a smallerdiameter than the inner face of said covering disc 7 so that itcompletely covers the opening in the container and a portion of thecontainer adjacent the opening therein and means defining an annulargroove in the inner face of said elastomeric disc 7 adjacent the outerperipheral edge of said Teflon layer 8, said groove overlying theportion of the container adjacent the opening therein.

1. A medicine bottle closure that can be stuck through, with a flangedcap and with a sealing disc which is made of at least two differentmaterials and which is anchored on the front face of the bottle mouth,characterized in that a sealing disc 3 which seals the flat front face 5of the bottle mouth 1a, which is made with a bevel-off 6 of its outerrim, consists of a layer, preferably of a Teflon disc 8 or of a similarfoil, which covers the bottle opening and approximately half thebottleneck frontface 5 annular area delimited by its outer and innerdiameters, and consists of an elastomeric gastight covering disc 7 whichcovers the bottle opening and the entire front face, upon the middlezone of which disc is applied the Teflon disc 8, and characterized inthat this covering disc 7 carries at its outer rim, as an anchorage, aridge 7b that fits the bevel 6 at the outer rim of the bottle mouth. 2.A closure, which can be stuck through, for medicine bottles, inaccordance with claim 1, characterized in that the ridge 7b of thecovering disc 7 is dimensioned, and preferably made somewhatwedge-shaped, so that after the flanging-in operation it is clampedtightly in position.
 3. A closure, which can be stuck through, formedicine bottles, in accordance with claim 1, characterized in that thebevel angle of the ridge 7b is flatter than the bevel 6 at the bottlemouth 1a, and preferably the apex 7c of the ridge 7b in its undistortedstate projects somewhat over the remaining diameter of the covering disc7.
 4. A cLosure, which can be stuck through, for medicine bottles, inaccordance with claim 1, characterized in that the middle zone of thecovering disc 7, which carries the Teflon disc 8 or the like, issurrounded by an annular groove
 9. 5. A closure, which can be stuckthrough, for medicine bottles, in accordance with claim 4, characterizedin that the Teflon disc 8 is drawn somewhat into the interior of theannular groove
 9. 6. A process for the production of a sealing discwhich consists of at least two different materials and is in accordancewith one of the foregoing claims, and which forms a sealing disc whichcan be stuck through, for the closure of medicine bottles, characterizedin that an elastic raw-rubber plate 7a, consisting of a rubber mixturehaving in its freshly prepared state an adhesive effect, is covered witha disc 8 of Teflon or similar foil having a roughened surface, and whilestill in a fresh state it pressed upon or applied upon it the said foil;and characterized in that in a second operation the side of theraw-rubber plate to which the Teflon foil is applied is laid in a pressupon a circular cutting tool 20 having a greater diameter than the innerdiameter of an annular groove 9 in the covering disc in its finishedstate, and is pressed under relatively high pressure until the elasticraw-rubber plate 7a is compressed to such an extent that thecounterpressure becomes so great that the cutting tool cuts through theTeflon foil and the raw-rubber plate, after which, after relief of thepressure, the reascending diameter-decreasing covering disc blank 7a,with its applied disc 8 of Teflon or the like, now projecting over theinner diameter of the subsequent groove 9, is in a third operationbrought to the final peripheral form (al, 22 22) of the sealing disc 3and is subjected to a vulcanization operation, whereby the projectingedges of the applied Teflon disc become bent into the inner zone Bdelimited by an annular mold part f which forms the groove 9 in thesealing disc
 3. 7. A closure, which can be stuck through, for medicinebottles, in accordance with claim 2, characterized in that the middlezone of the covering disc 7, which carries the Teflon disc 8 or thelike, is surrounded by an annular groove
 9. 8. A closure, which can bestuck through, for medicine bottles, in accordance with claim 3,characterized in that the middle zone of the covering disc 7, whichcarries the Teflon disc 8 or the like, is surrounded by an annulargroove
 9. 9. A closure adapted to be held in place over the opening in acontainer by a flanged cap comprising an elastomeric gastight coveringdisc 7, a layer 8 of Teflon secured to the inner face of said coveringdisc 7 confronting the container opening, said layer 8 being of asmaller diameter than the inner face of said covering disc 7 so that itcompletely covers the opening in the container and a portion of thecontainer adjacent the opening therein and means defining an annulargroove in the inner face of said elastomeric disc 7 adjacent the outerperipheral edge of said Teflon layer 8, said groove overlying theportion of the container adjacent the opening therein.